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start_post_processing() may be called from the freewheeling
callback, when starting to normalize.
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Ardour's playback is aligned to master-out:
"When the playback clock reads 01:00:00:00, the sample corresponding
to 01:00:00:00 is audible at the speaker(s)"
When exporting, and grabbing data from output ports, the signal
is offset by the master-bus physical playback latency. This was
compensated for, but lead to initial silence in the exported file.
New approach is to start capturing export data during pre-roll,
at the time when playback is written to the output buffers.
To also shaves off a common offset to make this work with
realtime export. Effectively this emulates processing with
disconnected master-output port, while still keeping any
latency of effects on the master-bus itself.
Last but not least: jack updates latencies when freewheeling,
(setting HW latency to zero). The callback arrives asynchronously
some time after enabling freewheeling, but after Export
Ports have been configured. Those callbacks are ignored.
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After exporting a time-span, the next time-span was started
directly from the rt-callback. This had various issues.
In particular with realtime export.
Post-processing of a realtime-export enables freewheeling
and is driven by freewheel callbacks. Freewheeling needs to be
safely disabled for an upcoming realtime export.
A similar issues existed when mixing realtime and non-realtime exports.
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* external, system-wide first <>
* next "pbd/*"
...
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For reasons yet to be investigated, closing stderr when using a
pipe into ffmpeg results in ffmpeg's stderr being written
verbatim in the output file.
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SFC_SET_COMPRESSION_LEVEL was only added in 2012 and only available in
libsndfile 1.0.26 or later.
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This also prepares for codec-quality defaults, but
ExportFormatSpecification does not yet set those for previously unset
or new formats/presets.
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This adds an experimental pipe to ffmpeg to encode mp3. Currently
quality is hardcoded and various aspects remain to be implemented.
However, it is sufficient for initial testing.
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Generated by tools/f2s. Some hand-editing will be required in a few places to fix up comments related to timecode
and video in order to keep the legible
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This reverts commit 6784923a0587e9549f129faa7c75d784028d11a1.
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All float values defined in the CONFIG_VARIABLE macro seem like they are cast
to at some stage before writing (another issue that needs addressing). The
default value for export-silence-threshold (-INFINITY) is converted to a value
of 0 and as a result nothing is exported with trim enabled.
Use the same fixed silence threshold as Mixbus until proper bounds checking and
GUI is in place.
Related: #6412
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post-processing is no longer just Normalization. RealtimeExport
does Encoding - faster than realtime - using the same infrastructure.
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This allows a TmpFile pointer to be either a Sync or Async (Threaded)
writer. As result we must be able to handle both RT and non RT processing.
Still, post-processing (normalization and encoding) should always
happen faster than realtime (freewheeling).
Since jack does not allow a client to change to freewheeling from within
the process-callback, the async-writer disk-thread FileFlushed is used
to initiate post-processing.
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* add a threaded TmpFile Writer
* update API calls to that process_export_fw() can be used as
process_function
The idea is to re-use export infrastructure from normalization:
export to a tmp-file and then encode target formats after that.
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(it doesn't have a version that understands 'framecnt_t')
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* consistent spectrum display for all reports (same binsize)
* improved performance (power of two)
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Paul Davis was responsible for introducing almost all of this.
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[Reviewed by] Andriy Mishyn
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to be complete)
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(required to be buildable with MSVC)
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If multiple filenames have the same extension, append the format name
to the filename. This still requires a bit of extra logic to be optimal,
as the format name will now be added in some situations where it is not
needed. However, this is better than producing a broken file...
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git-svn-id: svn://localhost/ardour2/branches/3.0@13856 d708f5d6-7413-0410-9779-e7cbd77b26cf
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git-svn-id: svn://localhost/ardour2/branches/3.0@13371 d708f5d6-7413-0410-9779-e7cbd77b26cf
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situations
git-svn-id: svn://localhost/ardour2/branches/3.0@12919 d708f5d6-7413-0410-9779-e7cbd77b26cf
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